With an additional blue lesson of Sokka's Haiku having already been revealed, Bumi, King of Three Trials will likely thrive better as a blue-green color combo deck themed after Avatar: The Last Airbender
Traditionally toting large and aggressive creatures, the red and green color pairing of Gruul has had a storied lineage throughout Magic: The Gathering's history
Bread and butter black commons in OTJ Looking at cards like Corrupted Conviction, Nezumi Linkbreaker, Blacksnag Buzzard, Boneyard Desecrator, or Overzealous Muscle, I dont think Black has any bad commons
Chief among them are Collector Boosters and Collector Editions of Commander Decks, which are sold out, but are selling at a mighty high markup on the secondary market right now
For example, characters like Aang, Katara, and Sokka all have a card dedicated to them in one or two colors, gradually progressing to three or more colors